Adding-machine.



F. MADSEN & F. e. WANDREY.

ADDING MACHINE.

APPLICATION FILED JULY 9, 1912.

Patented Sept. 15, 1914.

3 SHEETS-5HEET 1 FIG-Z P. MADSEN & P. G. WANDREY.

ADDING MACHINE.

APPLICATION FILED JULY 9, 1912. 1, 1 10,327, Patented Sept. 15, 1914.

3 SHEETSSHEET 2.

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F. MADSEN & F. G. WANDREY.

ADDING MACHINE.

APPLICATION FILED JULY 9.1912.

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,shaft and the computing disks and wheels FRED MADSEN AND FRED G. WANDREY, 0F WAUTOMA, WISCONSIN.

ADDING-MACHINE.

Specification. of Letters Patent.

Patented Sept. 15, 1914.

Application filed July 9, 1912. Serial No. 708,531.

To all whom it may concern Be it known that we, FRED MADSEN and FRED G. VVAN REY, citizens of the United States, residing at Wautoma, and in the county of .Vaushara and State of Wisconsin, have jointly invented a new and useful Adding-Machine, in which a series of combined ratchet and toothed wheels are independently mounted upon a shaft and a series of combined computing and toothed wheels are independently mounted upon a shaft.

The objects of our invention are to provide simple means whereby computations can be mechanically and accurately made, and to generally improve the construction of such devices. These objects, I attain, by the mechanism illustrated in the accompanying drawings, in which Figure l is a perspective view. Fig. 2 is a vertical section taken on line 2 2, Fig. 3. Fig. 3 is a front elevation showing the cover removed. 4 is a perspective view of one of the ratchet and computing wheels together with its actuating knob. Fig. 5 is a perspective view showing the zero setting mounted thereon, some of the computing wheels and disks being shown in section. Fig. 6 is a transverse section of the zero setting. shaft showing one of the computing disks mounted thereon, and illustrating the pawl and its spring. Fig. 7 is a view showing a portion of one of the combined toothed and ratchet wheels, its sliding contact and setting head.

Similar numerals of reference indicate similar parts in all the figures of the drawings.

In the accompanying drawings, 1 represents the casing, which is preferably of the form shown in Fig. 1 and is formed of a size to correspond with the size of the add ing machine designed to be constructed. To the sides of the casing 1 is connected the shaft 2, upon which shaft are independently mounted a series of pairs of combined ratchet wheels 3 and toothed computing wheels 4. These pairs of ratchet and toothed wheels may be formed integral or they may be made separate and connected together in any'convenient and well known manner.

For the purpose of actuating the toothed wheels 4, a series of bars'5 are provided, which bars are pivotally mounted upon the 5 shaft 2 and are extended outward between the pairs of ratchet and toothed wheels.

The offset ends of the bars 5 are each apertured for the passage therethroughof the sliding toothed bars 6 each bar being provided with'a tooth ,7, which tooth is formed of such a shape and size that it will properly fit between the teeth 8 upon the peripheries of the computing wheels 4. For the purpose of holding the teeth 7 out of engagement with the computing wheels -1 the springs 9 are provided, said springs being so arranged that they will normally hold the liding bars 6 and the teeth 7 out of contact with the computing wheels 4. When it is desired'to actuate any particular com puting wheel 4, the predetermined knob 10 is pressed inward after the particular bar 5 has been elevated or moved upward to the point where it is desired to engage the teeth 7 withthe particular wheel *1; for instance if it is desired to register 5 units the units bar 5 together with the different parts belonging thereto is moved upward until the tooth 7 comes between the teeth upon the opposite sides of the numeral 5 at which time the knob 10 is pushed inward, thereby coupling the bar to the units wheel 'Li after which the particular bar 5 is moved downward carrying with it the wheel to which it is coupled. This operation is the same with reference to all of the bars 5 and their different parts, reference being had to the number or numbers desired to be added.

For the purpose of holding the bars 5 in their lowered position and preventing any accidental displacement of the same, the springs 11 are provided, which springs are connected to the various bars 5 and to the fixed pins 12 or their-equivalents These springs also serve the purpose of assisting in pulling the levers 5 downward after they have been coupled to the predetermined computing wheel 4,.

It will be understood that the springs 11 should be so tensioned that a slight down ward push must be given to the various knobs 10 to move the levers or bars 5 down ward. For the purpose of preventing any backward movement of the various computing wheels 4 as the levers or bars are moved upward, a series of spring bars 13 are provided, whichspring bars are connected to the rear or back of the casing 1 as best illustrated in Fig. '2 and their inner ends arranged to engage the teeth of the ratchet wheels 3. In some instances and especially for the correction of any errors it may be .out of engagement with the teeth of the ratchet wheel 3. The springs 13 normally bear upon one of the fiat faces of the angle bar 14, thereby preventing any accidental rotation 01 the angle bar 14.

For the purpose oi rocking the angle bar 14 it is provided with-the rearward extending arm 15 to which arm is pivotally attached the rod 16, which rod is extended upward and through the top oi the case 1 and is provided with the operating knob 17 For the purpose of exerting additional tension upon the springs 13, a series 01 springs 18 may be provided, said springs being conn'ccted to the springs 13 and to the eyes 19 or their equivalents.

It will be understood that by providing the additional coiled springs 18, the springs 13 can be formed less rigid, thereby providing an easy spring action as the ratchet wheels ,5 are rotated. In the top or upper portion of the casing 1 is located the shaft or rod 20 upon which rod are independently mounted the toothed wheels 21 and the amount or total disks 22, said toothed wheels and amount or total disks being formed in pairs in substantially the same manner that the computing wheels and ratchet wheels 3 and 1 are formed. It will be understood that the teeth of the computing wheels 4: and the teeth of the various wheels 21 should mesh so that as the computing wheels 4 are rotated, rotary motion will be im'parted'to the wheels 21 and the disks 22. I

To effect the carry-over, each disk 22, with the exception of the last of the series, 5. e 1 that registering hundreds of thousands), is

provided upon its inner face with a pick-up tooth 23 which prl ije'cts laterally toward the disk of the next higher order. These pickup teeth are designed toengage the adjacent computing wheels 4 once during each complete revolution of the disks by which they are respectively borne. The length of the said pick-up pins is such that they terminate short of the gears or toothed wheels 21, and in this way their passage between the latter and the computing wheels -i'is avoided, it being understood that the said gears or toothed wheels 21 likewise are comparatively thin or narrow. In consequence, it will be apparent that during one complete revolution of each disk 22, its pick-up pin 23 will engage, and subsequently disengage the particular computing wheel 1 which meshes with and thus controls the toothed wheel or gear 21 on the disk 22 of next higher order, and 111-8) doing will rotate the said computing wheel st one step. This movement of the computing wheel will be transmitted, in turn, to the said wheel or gear 21 and thence to the disk 22 of next higher order, with the'result that the latter is rotated one step, thus producing the carry-over.

When it is desired to place the machine at zero the shaft 20 is rotated to the right and as it is rotated the various wheels 21 and 22 will be picked up by reason of the detents or dogs 2 1 coming in contact with the recesses 2& formed in the shaft 20. It will be understood that the recesses 2? should be so formed and the teeth 25 upon the detent or dogs so formed that during the time the machine is in action the amount or total wheels will rotate freely upon theshaft 20, or in other words the detents or dogs will ride over the recesses; but when the shaft 20 is rotated the teeth 25 will come in contact.

with the straight edge 26 of the recesses formed in the shaft 20 thereby causing the various wheels and disks 21 and 22 to r0- tate with the rotation of the shaft 20. It

will, however, be understood that as the shaft 20 rotates the various wheels and disks 21-aud 22 will be moved with reference to the location of the detents or dogs 24 and the numerals upon the amount or total disks should be so arranged with reference to the detents or dogs that when all of the wheels '21 and the disks 22 are moved by the shaft 20 the ciphers 27 will be in alinement, thereby reading naught or zero.

For the purpose of readin the various amounts to be computed or ad ed the casing 1 should be provided with suitable openings 28, thereby exposing to view the proper total shown upon the amount or total disks 22. In Fig. 1 the scale or computing strips 29 are located upon the right hand side of each computing wheel 4, but it is immaterial as to which side of the computing wheels these computing strips or scale plates are located. In some instances it may be con venient to have the plates or strips arranged upon the left hand sides of the computing wheels. The intermediate strips are locatcd directly over the ratchet wheels 3, thereby covering said wheels, but of course there must be space enough between each pair of computing wheels andratchet wheels to allow the bars or levers 5 to lie between we claim as new and desire to secure by Let'- upon one of the fiat faces of said bar; and tens Patent, is 1 means for rocking said bar to cause one of In an adding machine, the combination of its corners to raise said springs and. disena casing; a shaft mounted therein; a series gage the same frmnsaid ratchet-s.

5 of computing Wheels loose 011 said shaft; :1 In testimony that we claim the above, we ratchet Wheel combined with each colnputhave hereunto subscribed our names in the ingyvheel; a series of leaf springs mounted presence of two witnesses. Within said casing and'engaged with said FRED MADSEN.

ratchet wheels for holding the same against FRED G. IVANDREY.

1e retrograde movement; an angle bar rotatably mounted in said casing parallel with i said shaft, said springs normally resting Witnesses:

GAD J ONES, LAWRENCE MIELKE.

@opies eii' 2M2 patent may he obtained for me cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

